The patient performs the bedtime salivary cortisol test at home, obtaining samples two nights in a row and mailing them to a laboratory The overnight dexamethasone suppression test entails taking 1 mg of dexamethasone at bedtime, then measuring serum cortisol the next morning.

MIAMI -- A dexamethasone suppression test can identify patients at increased risk of suicide, according to a follow-up study presented at the annual conference of the American Association of Suicidology.

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